From b26cb0c9ac406e03ee54aa07d36350feae8c9bfc Mon Sep 17 00:00:00 2001
From: Alex Shabalin <alex.shabalin@tweag.io>
Date: Tue, 23 Nov 2021 16:15:34 +0100
Subject: [PATCH] Fix use after free in content-address.cc

Inspired by https://github.com/NixOS/nix/pull/5599
---
 src/libstore/content-address.cc | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/src/libstore/content-address.cc b/src/libstore/content-address.cc
index 974d1c471..cf32ccdc4 100644
--- a/src/libstore/content-address.cc
+++ b/src/libstore/content-address.cc
@@ -120,8 +120,10 @@ ContentAddress parseContentAddress(std::string_view rawCa) {
 
 ContentAddressMethod parseContentAddressMethod(std::string_view caMethod)
 {
-    std::string_view asPrefix {std::string{caMethod} + ":"};
-    return parseContentAddressMethodPrefix(asPrefix);
+    std::string asPrefix = std::string{caMethod} + ":";
+    // parseContentAddressMethodPrefix takes its argument by reference
+    std::string_view asPrefixView = asPrefix;
+    return parseContentAddressMethodPrefix(asPrefixView);
 }
 
 std::optional<ContentAddress> parseContentAddressOpt(std::string_view rawCaOpt)